This bold medieval keep may look forbidding but inside, it’s full of art and riches – not to mention intriguing tales. Alloa Tower is the largest surviving keep in Scotland, boasting lavish interiors where kings and queens once wandered. The tower dates back to the fourteenth century and was built to guard a strategically important ferry crossing on the nearby River Forth. It became the ancestral seat of the Erskines, the Earls of Mar and Kellie. The family have played a pivotal part in history